diff --git a/simple.make b/simple.make
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+# Copyright © 2019 Jeremiah Orians <jeremiah@pdp10.guru>
+# Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# This file is part of Gnu Mes
+#
+# Gnu Mes is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Gnu Mes is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Gnu Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+CC = gcc
+MES_CPU=x86_64
+MES = bin/mes-gcc
+
+MESCC_CPU=x86
+MES = bin/mes-gcc
+
+#CC = i686-unknown-linux-gnu-gcc
+#MES_CPU = x86
+
+M2_PLANET = M2-Planet
+
+CFLAGS:=					\
+  $(CFLAGS)					\
+ -D _GNU_SOURCE					\
+ -D const=					\
+ -ggdb						\
+ -D SYSTEM_LIBC=1				\
+ -D 'MES_VERSION="git"'				\
+ -D 'MES_PKGDATADIR="/usr/local/share/mes"'	\
+ -I include					\
+ -fno-builtin					\
+ -Wno-discarded-qualifiers			\
+ -Wno-discarded-array-qualifiers		\
+ -Wno-ignored-qualifiers			\
+ -Wno-incompatible-pointer-types		\
+ -Wno-int-conversion
+
+MES_SOURCES =					\
+ src/gc.c					\
+ src/hash.c					\
+ src/lib.c					\
+ src/math.c					\
+ src/mes.c					\
+ src/module.c					\
+ src/posix.c					\
+ src/reader.c					\
+ src/string.c					\
+ src/struct.c					\
+ src/vector.c
+
+LIB_SOURCES =					\
+ lib/mes/eputs.c				\
+ lib/mes/itoa.c
+
+M2_SOURCES =					\
+
+M2_TODO =					\
+ lib/m2/file_print.c				\
+ lib/m2/ntoab.c					\
+ lib/mes/fdgetc.c				\
+ lib/mes/fdungetc.c
+
+SOURCES = $(M2_SOURCES) $(LIB_SOURCES) $(MES_SOURCES)
+INCLUDES =					\
+ include/mes/builtins.h				\
+ include/mes/constants.h			\
+ include/mes/mes.h				\
+ include/mes/lib.h				\
+ include/mes/lib-mini.h
+
+MES_LIBC =					\
+ lib/linux/$(MES_CPU)-mes-gcc/syscall.c		\
+ lib/linux/_read.c				\
+ lib/linux/_read.c				\
+ lib/mes/__buffered_read.c
+
+GCC_SOURCES =					\
+ lib/mes/__mes_debug.c				\
+ lib/mes/eputc.c				\
+ lib/mes/fdgetc.c				\
+ lib/mes/fdputc.c				\
+ lib/mes/fdputs.c				\
+ lib/mes/fdungetc.c				\
+ lib/mes/mes_open.c				\
+ lib/mes/ntoab.c				\
+ $(SOURCES)
+
+mes-gcc: bin/mes-gcc
+mes-m2: bin/mes-m2
+
+bin/mes-gcc: $(MAKEFILES) $(GCC_SOURCES) $(INCLUDES) | bin
+	$(CC) $(CFLAGS) $(GCC_SOURCES) -o $@
+
+M2_PLANET_INCLUDES =				\
+ include/mes/mes.h				\
+ include/mes/m2.h				\
+ include/mes/constants.h
+
+M2_PLANET_PREFIX = ../M2-Planet
+M2_PLANET_SOURCES =						\
+ $(M2_PLANET_PREFIX)/test/common_amd64/functions/exit.c		\
+ $(M2_PLANET_PREFIX)/test/common_amd64/functions/malloc.c	\
+ $(M2_PLANET_PREFIX)/functions/calloc.c				\
+ $(M2_PLANET_INCLUDES)						\
+ $(SOURCES:%.c=%.c.m2)
+
+%.c.m2: %.c $(MAKEFILES)
+	@sed -r 's@^(#include.*)@/* \1 */@' $<	\
+	| $(CC) -E -I include			\
+	    -D FUNCTION0=FUNCTION		\
+	    -D FUNCTION1=FUNCTION		\
+	    -D FUNCTION2=FUNCTION		\
+	    -D FUNCTION3=FUNCTION		\
+	    -D FUNCTIONN=FUNCTION		\
+	    -D const=				\
+	    -o $@ -x c -
+
+bin/mes-m2: $(MAKEFILES) $(M2_PLANET_SOURCES) $(M2_PLANET_INCLUDES) | bin
+	$(M2_PLANET) $(M2_PLANET_FLAGS) $(M2_PLANET_SOURCES:%=-f %) -o $@ || rm -f $@
+
+# Clean up after ourselves
+.PHONY: clean
+clean:
+	rm -rf bin/
+
+.PHONY: check check-gcc check-m2 check-hello check-base check-gc check-mescc
+check-gcc:
+	$(MAKE) -f simple.make check MES=bin/mes-gcc
+check-m2:
+	$(MAKE) -f simple.make check MES=bin/mes-m2
+
+check: check-hello check-base check-gc check-mescc
+
+check-hello: $(MES)
+	echo '(display "hello\n")' | MES_BOOT=boot-01.scm $(MES)
+
+check-base: $(MES)
+	MES_DEBUG=4 MES_PREFIX=mes MES=$(MES) tests/base.test
+
+check-gc: $(MES)
+	MES_DEBUG=3 MES_ARENA=10000 MES_MAX_ARENA=10000 MES_BOOT=tests/gc.test $(MES)
+
+check-mescc: $(MES)
+	rm -f a.out
+# this already needs succesful GC
+#	MES_DEBUG=1 MES_PREFIX=mes MES=$(MES) sh -x scripts/mescc -- -I include -nostdlib lib/string/strlen.c lib/mes/eputs.c scaffold/hello.c
+	MES_DEBUG=1 MES_PREFIX=mes MES=$(MES) sh -x scripts/mescc -- -m 32 -I include -nostdlib lib/linux/$(MESCC_CPU)-mes-mescc/crt1.c scaffold/main.c
+	./a.out; r=$$?; if [ $$r != 42 ]; then exit 1; fi
+
+
+# Directories
+bin:
+	mkdir -p bin
+
+TAGS:
+	etags $(shell find . -name '*.c' -o -name '*.h') --language=scheme $(shell find mes module -name '*.mes' -o -name '*.scm')